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Supplementary Financial Information | 12 Months Ended
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Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Supplementary Financial Information | 21. Supplementary Financial Information The following is a summary of the activity in our allowance for doubtful accounts (in thousands):
|  | Years Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Balance at beginning of year |  | $ | 454 |  |  | $ | 356 |  |  | $ | 1,431 |
Provision |  |  | 200 |  |  |  | 102 |  |  |  | 117 |
Write offs |  |  | (402 | ) |  |  | (9 | ) |  |  | (1,171 | )
Adjustment (1) |  |  | (80 | ) |  |  | 5 |  |  |  | (21 | )
Balance at end of year |  | $ | 172 |  |  | $ | 454 |  |  | $ | 356 |
(1) | Primarily foreign currency translation adjustments.

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